Interval and subinterval perturbation methods for a structural-acoustic system with interval parameters

Interval and subinterval perturbation methods have been widely applied in response analyses of the uncertain structure with interval parameters. In this paper, based on the characteristics of structural-acoustic systems, the interval and subinterval perturbation methods are extended to calculate the frequency response intervals of a structural-acoustic system with interval parameters. In the extended methods, the interval dynamic equilibrium equation of the structural-acoustic system is established, and interval operations are implemented at an element-by-element level in the finite element framework. The numerical results for two structural-acoustic models verify the accuracy and effectiveness of the proposed methods.

► Interval perturbation method for uncertain structural-acoustic system. ► Subinterval perturbation method for uncertain structural-acoustic system. ► The accuracy of IFEM is improved with the increase in number of sub-intervals.